Specifications

Interrupts/diagnostics alarms
5.2 Interrupts
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 07/2014, A5E03485952-AD
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5.2
Interrupts
Digital input module DI 16x24VDC HF supports diagnostic and hardware interrupts.
Diagnostic interrupt
The module generates a diagnostic interrupt at the following events:
● Missing supply voltage L+
● Wire break
Hardware interrupt
The module generates a hardware interrupt at the following events:
● Positive edge
● Negative edge
● Positive and negative edge
For detailed information on the error event, refer to the hardware interrupt organization block
with the "RALRM" instruction (read additional interrupt information) and to the STEP 7 online
help.
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. The following figure shows the assignment to the bits of double
word 8 in local data.
Figure 5-2 OB start information